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January 26, 7 PM: Snowfall Update

Clipper continues to zip through with snow.

Posted: Jan 26, 2019 6:35 PM
Updated: Jan 26, 2019 7:14 PM

Nice band of good frontagenetical forcing oriented over the area is resulting in some good snowfall rates with this clipper.

Warmer, moist air is being thrust northward well north of the clipper's warm front & pushed into the 5000-12,000' layer.  Here the air is being lifted, cooled & saturated.  This layer is the Snow Growth Zone or Dendritic Growth Zone.  This is a nice deep layer of lift & moisture with the perfect -20 to -10 for snowflake production just in the right zone.

I just measured a new 1.5" 2 miles West of West Lafayette.  It is dry & powdery just like lastnight & typical of these clippers.  The 1.5" melted down to only 0.05". 

This should all exit by 11 p.m.

At least 1-3" of snow is expected area-wide.  However, some areas in the northern half will see totals exceeding 3".

Winds will pick up from the southwest, then briefly west, then northwest.  These winds will increase to 15-25 mph.  I cannot rule out a couple gusts in the area to 30 mph.

These higher winds should occur in the 8 p.m. to 2 a.m. time frame, overall.  However, gusts to 19 mph are still possible tomorrow morning with some minor blowing & drifting in places.

Given such dry, light, fluffy & powdery snow, extensive blowing & drifting will occur.  Drifts of the new snow may get quite deep in open, rural areas at +11".

This, with slick, snow-covered roads will result in rough travel tonight

The next few hours:

Winds the next few hours:

Monday morning to Monday night:

(Note the band of almost convective heavy snow with the Arctic front........like a squall line!...........Looks like a squall-line type burst of heavy snow with gusts in places 40-50 mph.  Flash freeze will proceed snow squall line with temperature drop from 33 to 10 very quickly.

Winds during the day will run 20-40 mph with snow to ice to ice/rain to snow, then snow squall, then some snow showers.

Overall 1-4" snow is possible north half, 1" or less rest of the area with minor ice accumulation.  However, snow squall line could put down a sudden 0.5-1" to add to that viewing area-wide.

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